[edit: sorry, in this post I assumed that porchelvr was pregnant. She didn't say anithing about that herself]
ok, this could be serious. When he reacts that strongly to you needing rest when you are pregnant, and especially if he could just go to another computer, then there is trouble.
It might seem moderately scarry now, but I am going to add a really scarry statistic here. The most common cause of death among pregnant women is homicide by their s.O.
If he can not handle the changes now that you are pregnant, it is also likely that he can not handle the big changes that occur after the baby is born.
This is serious stuff. You might still consider your options at this time, but guaranteed, if this continues then it is time to get out, and at that point rather than later. Don't take it lightly. What he did constitutes *assault* and is a crime. Possibly, because you are pregnant, it is elevated to *aggrevated assault.* guys get thrown in jail for this, particularly because of the forementioned statistic.
At least set up an emergency plan. Talk to your family or a close friend so you have a place to go if you need to. See if you can leave extra sets of clothes and a bit of money at your safe place. It might never be needed, but that's a lot better than you running for your life without a goal or a plan some day. You *need* a backup plan at this point.